Assessing the impact of diagenesis on foraminiferal geochemistry from a low latitude, shallow-water drift deposit

Stainbank, Stephanie; Spezzaferri, Silvia; Boever, Eva De; Bouvier, Anne‐Sophie; Chilcott, Colin P.; Leau, Erica S. de; Foubert, Anneleen; Kunkelová, Tereza; Pichevin, Laetitia; Raddatz, Jacek; Rüggeberg, Andres; Wright, James D.; Yu, Siyao; Zhang, Manlin; Kroon, Dick

doi:10.1016/j.epsl.2020.116390

Cited by 16 publications

(37 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A diagenetic mechanism for such a stratigraphic offset seems implausible since seafloor diagenesis tends to increase the δ 18 O of foraminifer calcite (Kozdon et al, 2013; Pearson et al, 2001), yet δ 18 O values decrease over the CIE/OIE interval. Though the isotopic compositions of foraminifer shells within the Site 690 PETM section appear to have been altered (Kozdon et al, 2020), studies indicate that stratigraphic trends in stable isotope records signaling environmental change and secular variation in ocean chemistry are not expunged from the deep‐sea sedimentary record by diagenesis (Edgar et al, 2015; Stainbank et al, 2020). Moreover, some of the smaller size classes of reworked shells within the CIE interval register δ 13 C (~3‰) and δ 18 O (−0.5‰) values that are remarkably similar to those of similarly sized shells within the underlying pre‐CIE interval (Figures 4a–4d and 5a–5d).…”

Section: Discussionmentioning

confidence: 99%

Delays, Discrepancies, and Distortions: Size‐Dependent Sediment Mixing and the Deep‐Sea Record of the Paleocene‐Eocene Thermal Maximum From ODP Site 690 (Weddell Sea)

Hupp

Kelly

2020

Paleoceanog and Paleoclimatol

View full text Add to dashboard Cite

The deep-sea sedimentary record of Ocean Drilling Program Site 690 (Weddell Sea) has figured prominently in the study of an ancient (~56 Ma) global warming event referred to as the Paleocene-Eocene Thermal Maximum (PETM). Yet discrepancies in the timing, amplitude, and structure of the isotopic excursions marking the PETM exist between the bulk-carbonate and planktic foraminifer stable isotope (δ 13 C and δ 18 O) records of this reference section. A recent study invoked size-dependent sediment mixing (SDSM) to reconcile the discrepancies between these parallel δ 13 C records. Here we report supplementary stable isotope data compiled from size-segregated planktic foraminifer shells that further elucidate the effects of SDSM on the Site 690 PETM section. Our records reveal a stratigraphic sequence where the carbon (CIE) and oxygen (OIE) isotope excursions marking the onset of PETM conditions are first registered by larger shells, confirming that smaller-sized pre-CIE shells have been more intensely mixed and preferentially displaced up-section into the overlying CIE interval. The size-dependent manner in which the CIE and OIE are recorded by asymbiotic subbotinids indicates that the transitory loss of size-dependent δ 13 C signatures in photosymbiotic taxa (acarininids) at Site 690 is an artifact of SDSM. Synthetic bulk-carbonate δ 13 C records generated with two end-member (pre-CIE versus CIE materials) sediment-mixing curves readily reproduce the series of "steps" seen in published bulk-carbonate δ 13 C records of the CIE, suggesting that these fine-scale features may also be artifacts of SDSM and varying rates of carbonate sedimentation.

show abstract

Section: Discussionmentioning

confidence: 99%

Delays, Discrepancies, and Distortions: Size‐Dependent Sediment Mixing and the Deep‐Sea Record of the Paleocene‐Eocene Thermal Maximum From ODP Site 690 (Weddell Sea)

Hupp

Kelly

2020

Paleoceanog and Paleoclimatol

View full text Add to dashboard Cite

show abstract

“…This record is a supplement to the long‐term SML to thermocline planktonic and benthic foraminiferal geochemical records (δ 18 O, δ 13 C, and Mg/Ca) produced from Site 359‐U1467 by Stainbank et al. (2020a).…”

Section: Methodsmentioning

confidence: 99%

“…All samples are from IODP Site 359‐U1467 with the age model adopted from the study by Stainbank, et al. (2020a), which is based on the correlation of their long‐term (0–1,800 kyr) Cibicides mabahethi and Globigerinoides ruber (w) δ 18 O records to the stacked reference curve of Ahn et al. (2017) (Prob‐stack).…”

Section: Methodsmentioning

confidence: 99%

“…Species‐specific Mg/Ca‐temperature equations were used, for both the long‐term G. ruber (w) Mg/Ca record of Stainbank et al. (2020a) and multispecies climatic extreme Mg/Ca data, to calculate Recent and paleotemperature estimates (Table 2).…”

Section: Methodsmentioning

confidence: 99%

“…(1981) and the G. ruber (w) δ 18 O data of Stainbank et al. (2020a) to calculate the long‐term surface water δ 18 O sw variability (Table 3). Furthermore, available species‐specific δ 18 O‐temperature equations, as applied in Stainbank et al.…”

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

Monsoon and Tropical Climate Forcing on the Physicochemical and Thermocline Characteristics of the Maldives Inner Sea: Insights From Marine Isotope Stages 1–2 and 10–13

Stainbank

Spezzaferri

Rüggeberg

et al. 2021

Paleoceanog and Paleoclimatol

Self Cite

View full text Add to dashboard Cite

The Maldivian archipelago, in the equatorial Indian Ocean, provides a unique location to assess long‐term basin‐wide South Asian Monsoon (SAM) processes as well as its response during climatic extremes. This insight is beneficial to better understand future SAM influences on the Maldives Inner Sea physicochemical characteristics and its diverse tropical ecosystems in a warming world. This study uses samples from International Ocean Discovery Program Expedition 359, drilled within the Inner Sea drift deposits. Multiple foraminiferal species (n = 15) and proxies (δ18O, δ13C, and Mg/Ca) are used to assess glacial‐interglacial SAM dynamics influencing the Inner Sea conditions across Marine Isotope Stages (MIS) 1–2 and 10–13. The summer SAM is modulated by insolation and atmospheric CO2 and has a predominant impact on the northern Indian Ocean surface salinity. As with present‐day observations, a strong summer monsoon resulted in large basin‐wide δ18Osw (salinity) gradients during the interglacials. Moreover, at the MIS11 minimum (MIS11c), a recognized analog for the present‐day, sea surface temperatures (SSTs) were warmer than the present with a stronger summer SAM. This led to an expanded surface mixed layer and strong thermocline, resulting in a highly stratified water column and prominent oxygen minimum zone in the Inner Sea during MIS11c. SSTs in the Maldives are projected to increase at the end of this century and based on the reality that current warming (anthropogenically driven) is much faster than seen during MIS11, the Maldivian tropical coral reef and benthic shoal ecosystems will be subject to increasing stress.

show abstract

Ostracod response to monsoon and OMZ variability over the past 1.2 Myr

Zarikian

Nadiri

Alonso-García

et al. 2022

Marine Micropaleontology

Self Cite

View full text Add to dashboard Cite

Assessing the impact of diagenesis on foraminiferal geochemistry from a low latitude, shallow-water drift deposit

Cited by 16 publications

References 41 publications

Delays, Discrepancies, and Distortions: Size‐Dependent Sediment Mixing and the Deep‐Sea Record of the Paleocene‐Eocene Thermal Maximum From ODP Site 690 (Weddell Sea)

Delays, Discrepancies, and Distortions: Size‐Dependent Sediment Mixing and the Deep‐Sea Record of the Paleocene‐Eocene Thermal Maximum From ODP Site 690 (Weddell Sea)

Monsoon and Tropical Climate Forcing on the Physicochemical and Thermocline Characteristics of the Maldives Inner Sea: Insights From Marine Isotope Stages 1–2 and 10–13

Ostracod response to monsoon and OMZ variability over the past 1.2 Myr

Contact Info

Product

Resources

About